fix(route_handler): filter out start lanelets wrt start checkpoint orientation

[mehmetdogru]

Description

closes #5357

What this PR changes?

• route_handler filters start_lanelet's to eliminate improper oriented ones wrt start_checkpoint

Related links

Tests performed

cap-after.mp4

Notes for reviewers

Interface changes

Effects on system behavior

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (d36be55) 14.76% compared to head (7687286) 14.76%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5358   +/-   ##
=======================================
  Coverage   14.76%   14.76%           
=======================================
  Files        1662     1662           
  Lines      115411   115414    +3     
  Branches    35614    35616    +2     
=======================================
+ Hits        17044    17045    +1     
  Misses      79145    79145           
- Partials    19222    19224    +2     

Flag	Coverage Δ		*Carryforward flag
differential	15.09% <25.00%> (?)
total	14.76% <ø> (+<0.01%)	⬆️	Carriedforward from d36be55

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
planning/route_handler/src/route_handler.cpp	25.07% <25.00%> (+0.02%)	⬆️

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[shmpwk]

LGTM, thank you!